Disc reproducing device

ABSTRACT

A plurality of trays, each for holding a disc, are arranged in a disc arranging direction in a disc storage. A movable base is provided to be rotated about a shaft and a disc player having a turntable, a disc clamper and a pickup, is mounted on the movable base. A driving device is provided for rotating the movable base between a retracted position and a disc reproducing position. A lock device is provided on the chassis for engaging with the movable base at the disc reproducing position to minimize external vibrations to the movable base during disc reproduction.

BACKGROUND OF THE INVENTION

The present invention relates to a device for reproducing an opticaldisc selected from a plurality of discs stored in a disc storage, andmore particularly to a disc reproducing device mounted on a motorvehicle.

There is known a disc changer for reproducing an optical disc selectedfrom a plurality of discs stored in a disc storage.

In recent years, a disc changer has been proposed which disc changerreproduces a disc at its arranged position.

The disc changer is moved along the disc storage in the disc arrangingdirection. When the selected disc is reproduced, disc mounting traysadjacent the selected disc are moved in the disc arranging direction sothat spaces are formed on both sides of the selected disc. A discreproducing portion is moved from a retracted position to a reproducingposition, so that the disc reproducing portion is inserted into thespaces to reproduce the disc. Thus, the size of the disc changer isreduced in the direction perpendicular to the disc arranging direction.Hence, the disc changer is suitable to be mounted on the motor vehicle.

Japanese Patent Application Laid Open 3-176852 discloses a mechanism formoving the disc reproducing portion between the retracted position andthe reproducing position. The mechanism has a movable chassis on which aturntable, pickup and a pickup moving device for moving the pickup inthe radial direction of the disc are mounted. The movable chassis isrotated about a shaft between the retracted position and the reproducingposition.

The movable chassis is supported only by the shaft during thereproduction of the disc. Consequently, the movable chassis is liable tobe vibrated by external vibration. If the chassis is vibrated, the discis not properly reproduced. In particular, this problem is serious inthe disc changer mounted on the motor vehicle.

SUMMARY OF THE INVENTION

An object of the present invention is to provide a disc reproducingdevice which resolves the problem caused by the external vibration.

According to the present invention, there is provided a disc reproducingdevice comprising, a disc storage, a plurality of trays, each forholding a disc, arranged in a disc arranging direction in the discstorage, a shaft provided on a chassis, a movable base provided to berotated about the shaft, a disc player having a turntable, a discclamper and a pickup, and mounted on the movable base, driving means forrotating the movable base between a retracted position and a discreproducing position, lock means provided on the chassis for engagingwith the movable base at the disc reproducing position.

The lock means comprises two lock means to be engaged with movable baseat two positions.

The two lock means comprises a lock member mounted on the chassis, and alock arm pivotally mounted on the chassis so as to be moved between aretracted position and an engaging position.

The two positions are positioned at both sides of a line connecting theshaft and a center of the turntable.

A center of the turntable is positioned in an area surrounded by threelines connecting the two positions and the shaft.

These and other objects and features of the present invention willbecome more apparent from the following detailed description withreference to the accompanying drawings.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a perspective view of a disc changer according to the presentinvention;

FIGS. 2a, 2 b and 3 are plan views of a part of the disc changer;

FIG. 4 is a side view of a tray stack;

FIG. 5 is a front view of the disc changer;

FIG. 6 is a side view of a driving roller;

FIG. 7a is a plan view showing a disc player;

FIG. 7b is a plan view showing a cramper;

FIG. 8 is a side view showing a turntable;

FIG. 9 is a plan view showing the operation of the disc player;

FIGS. 10 to 12 are plan views showing another example of a movingmechanism;

FIG. 13 is a plan view showing a chassis;

FIG. 14 is a side view showing a slide plate;

FIG. 15 is a side view showing a disc separating member;

FIGS. 16 to 22 are side views showing the operation of the disc changer;and

FIGS. 23a to 23 c are schematic illustrations for explaining advantagesof the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to FIGS. 1, 2 a and 2 b showing the disc changer according tothe present invention, main composition of the device comprises a disccarrier 100 having a pair of driving rollers 101, a disc player 200having a turntable 201, cramper 202, pickup 203, a disc storage 300having six trays 301 (FIG. 2) for arranging discs in the Z-direction anda tray moving mechanism having a movable plate 400 for moving the tray301. These portions are provided in a chassis 1.

The disc carrier 100 is provided for carrying a disc inserted from anopening by a user to the disc storage 300, and for discharging the discin the storage 300.

The driving rollers 101 are provided to contact with the underside ofthe inserted disc and to carry it in the X-direction.

Referring to FIG. 3, the tray 301 has a disc supporting late 301 ahaving a V-shaped notch 301 b and a pair of notches 301 c. In the notch301 b, the turntable 201, cramper 202 and pickup 203 are inserted.Furthermore, the tray 301 has a pair of holes 301 d in which guideshafts 2 are inserted, a pair of disc holding members 301 e, fourprojections 301 f.

As shown in FIG. 4, the shaft 2 is inserted in the holes 301 d of sixtrays 301 and a hole of a regulating plate 302 on the stack of trays,thereby arranging the trays in the Z-direction. The regulating plate 302is urged by springs 303 provided inside wall of the chassis 1 so thatregulating plate 302 is prevented from upwardly moving. The regulatingplate 302 has a vertical member 302 a to hold the trays, therebypreventing the trays from moving in the Y-direction.

Referring to FIGS. 5 and 6 showing the disc carrier 100, a worm wheel101 a is formed on a side of each driving roller 101. The driving roller101 is rotatably mounted on an upright plate 103 a of a supporting plate103. A disc path regulating plate 106 is provided above the drivingroller 101 and rotatably supported by a shaft 103 b. Between the plate106 and the driving roller 101, a disc carrying path 102 is formed. Acoil spring 107 is provided between the regulating plate 106 and thesupporting plate 103 to urge the plate 106 toward the driving roller101.

A pair of rotatable shaft 105 are rotatably mounted on shafts 104. Anupper portion of the rotatable shaft 105 is supported by the supportingplate 103 and a worm 105 is formed on an upper most portion of therotatable shaft. The worm 105 is engaged with the worm wheel 101 a ofthe driving roller 101. A pulley 105 a is formed on one of the rotatableshaft 105, which pulley 105 a engages with a belt 109 of a motor 108(FIG. 2). Both rotatable shafts 105 have pulleys and are connected by abelt (not shown). Thus, both the shafts 105 are rotated by the motor 108through the belts.

Each supporting plate 103 has a downwardly projecting projection 103 c,passing through a hole formed in a movable plate 400. A movable member110 is slidably mounted on the chassis 1 and engaged with the projection103 c. Therefore, when the movable member 110 moves in the X-direction,each of the plates 103 is rotated about the shaft 104 to rotate thedriving roller 101 about the shaft 104.

Due to the above described construction, the driving rollers 101 aremoved between a disc carrying position and a retracted position. FIG. 2ashows the driving roller 101 at the disc carrying position, and FIG. 2bshows the one at the retracted position.

When the driving rollers 101 are located at the disc carrying position,the rollers are inserted in the notches 301 c as shown in FIG. 2a. Atthe positions, rollers are positioned in the Y-direction, where therollers are parallel with the roller insertion opening and located onthe disc mounted on the disc supporting plate 301 a.

The driving rollers 101 at the retracted position are positioned outsidethe notches 301 c as shown in FIG. 2b.

FIGS. 7a to 9 show the disc player 200 and the disc moving mechanism. Ona movable base 200 a of the disc player 200, there is provided theturntable 201, pickup 203, and pickup moving mechanism 204. The base 200a is rotatably supported by a shaft 401 on the movable plate 400. Aclamper base 205 is rotatably supported by a shaft 200 b on the base 200a and holds the clamper 202 at an end portion. A restriction portion 205a is formed on the clamper base 205. The clamper base 205 is urged tothe base 200 a by a spring 206 mounted on the shaft 200 b.

On the movable base 200 a, a clamp operation member 207 is provided.There is provided a pair of elongated holes 207 a, an elongated hole 207b perpendicular with the holes 207 a, and a roller 207 c. In each hole207 a, engaged is a pin 200 c projected from the base 200 a, so that themember 207 is movable in the axis direction of a shaft 200 b on themovable base 200 a.

The movable plate 400 has an arcuated hole 402 in which a movable pin 3is inserted. The pin 3 is further engaged with the elongated hole 207 b.The pin 3 is moved in the arcuated hole 402 by a driving mechanism (notshown).

The movement of the pin 3 causes the movement of the disc player betweenthe reproduction position and the retracted position and the disccramping operation.

In FIG. 7a, the disc player 200 is at the retracted position, where therestriction portion 205 a of the clamper base 205 is mounted on theroller 207 c of the cramp operating member 207, thereby releasing theclamper 202 from the turntable 201.

When the pin 3 is moved in the direction shown by the arrow, theoperating member 207 and movable base 200 a are rotated about the shaft401 in the clockwise direction. Thus, the disc player 200 is rotated tothe reproduction position shown by dot and dash lines in FIG. 9.

Immediately before the reaching of the pin to the end of the arcuatedhole 402, namely, immediately before the time when the disc playerreaches the reproduction position, the driving direction of the pin 3becomes parallel with the longitudinal direction of the elongated holes207 a of the operating member 207. Therefore, only the operating member207 is moved in the longitudinal direction with respect to the base 200a, so that the restriction portion 205 a of the base 205 removes fromthe roller 207 c. As a result, the clamper 202 is pressed against theturntable 201 by the coil spring 206.

As described above, the disc clamp operation is carried out with themovement of the disc player 200 from the retracted position to thereproduction position, and the clamping is done at the same time as thepositioning of the disc player 200 to the reproducing position. Theclamp is released when the disc player moves from the reproductionposition to the retracted position.

FIGS. 10 through 12 show a moving mechanism of the disc reproducingportion according to the present invention.

In the moving mechanism, a lock member 208 and a lock arm 209 areprovided on the movable chassis 400. The lock member 208 engages with anend portion of the movable base 200 a when the base reaches thereproducing position as shown in FIG. 11. The lock arm 209 is providedto be rotated between a retracted position shown in FIG. 10 and a lockposition shown in FIG. 12.

After the base 200 a has reached the reproducing position shown in FIG.11, the lock arm 209 is rotated from the retracted to the reproducingposition as shown by the arrow of FIG. 11, and an end portion of the armengages with an end portion of the base 200 a as shown in FIG. 12.

Thus, the base 200 a is held by the lock member 208, the lock arm 209and the shaft 401, so that the base 200 a is not vibrated by theexternal vibration during the reproduction of a disc.

The engaging position of the lock member 208 with the base 200 a and theengaging position of the lock arm 209 are at both sides of the lineconnecting the shaft 401 and the center of the turntable 201.Furthermore, the center of the turntable is in an area surrounded bythree lines connecting the engaging portion of the lock member 208, theengaging portion of the lock arm 209, and the shaft 401. Therefore, theturntable is stably supported, thereby preventing the reproduced discfrom vibrating.

FIG. 13 shows the chassis 1 and FIG. 14 shows the tray moving mechanism.

Referring to FIG. 13, an arm 4 is rotatably supported by a shaft 4 a atthe underside of the chassis 1. The arm is adapted to be pivoted by amotor (not shown).

As shown in FIGS. 1, 13 and 14, a pair of vertical guide plates 1 a areformed on both sides of the chassis 1, in the Z-direction. Slide plates5 and 6 are slidably attached on the guide plates 1 a. The slide plates5 and 6 have projections 5 a, 6 a at the lower ends thereof, whichprojections are pivotally connected to both ends of the arm 4.Therefore, when the arm 4 is pivoted, the slide plates are moved in theopposite directions.

As shown in FIG. 14, the slide plate 6 has a pair of holes 6 b in theX-direction, each of the holes 6 b slidably engages with a pin 1 c onthe guide plate 1 a. The slide plate has also the same holes as 6 b.Each guide plate 1 a has a vertical guide hole lb in which slidablyengaged is a pin 400 c provided on a vertical plate 400 b of the movableplate 400. Furthermore, the pin 400 c is slidably engaged with astepwisely inclined heaving hole 6 c formed in the slide plate 6. Theslide plate 5 has also heaving hole inclined in the reverse direction tothe hole 6 c. Thus, four pins 400 c engage with the heaving holes andare moved in the Z-direction when the slide plates 5 and 6 moves in theX-direction, which causes the movable plate 400 to vertically move.

The heaving hole has six steps which corresponds to the six trays.

FIG. 15 shows one of four tray moving members 410 which are pivotallymounted on the vertical plate 400 b at a shaft 410 a. A projection 410 bis slidably engaged with an arcuated groove 400 d formed in the verticalplate 400 b. The tray moving member 410 has an L-shaped hole 410 c inwhich a projection 301 f (FIG. 3) of the tray 301. There is formed fourcams 410 d, 410 e, 410 f and 410 g which are engaged with theprojections 301 f.

The operation of the device will be described hereinafter with referenceto FIGS. 16 through 22. FIGS. 16 through 20 show the operation formounting a disc inserted from the opening on the tray 301 of the discstorage 300. The operation is described about the mounting of theinserted disc on the second tray from the lower most tray.

FIG. 16 shows a waiting state. In the state, all trays are stacked up.The pin 400 c is mounted on the lower most step of the inclined hole 6c, and the movable plate 400 is positioned at the lower most position.The tray moving member 410 is retracted from the tray 310 so that thetray moving member does not strike the tray when the movable plate 400moves.

When the user inserts a disc in the opening, the slide member 6 is movedto the left and the slide member 5 is moved to the right by the arm 4 toraise the movable plate 400. When the pin 400 c reaches the second stepas shown in FIG. 14, the slide member 6 (the description about the slidemember will be omitted hereinafter) stops to stop the movable plate 400.At the position, the tray moving member 410 holds the second tray 301,engaging with the underside of the tray.

More particularly, the tray moving member 410 is rotated in theclockwise direction, so that the cam 410 d raises the projection 301 fof the third tray, thereby lifting the third through sixth trays.

On the other hand, the projection 301 f of the second tray mounts on thecam 410 e and enters the hole 410 c. Thus, the second tray is held bythe tray moving member 410.

Next, the slide member 6 is moved to the left to lift the movable plate400. Therefore, the third to sixth trays are raised by the cam 410 d,and the second tray is raised by the cam 410 e, leaving the first tray.

As shown in FIG. 18, when the pin 400 c reaches the upper most step, theslide member 6 stops. The second tray held by the tray moving member 410is placed at a position corresponding to the upper most tray positionbefore the lifting shown in FIG. 15. This position corresponds to theposition of the driving roller 101 of the disc carrier 100 (FIG. 5),where the insertion and discharge of the disc are performed at theheight.

As shown in FIG. 19, the tray moving member 410 is slightly rotated inthe clockwise direction, so that the third through sixth trays areraised by the cam 410 d although the second tray is not raised. Thus,there is formed a space above the second tray, in which space thedriving roller 101 can be inserted. Therefore, the driving roller 101 ismoved from the retracted position (FIG. 2b) to the disc carryingposition (FIG. 2a).

Thereafter, the driving roller 101 is driven so that the disc insertedby the user is carried. When the disc reaches the second tray, thedriving roller 101 is stopped.

Thereafter, as shown in FIG. 20, the tray moving member 410 is slightlyrotated in the clockwise direction, so that the second tray 301 isslightly elevated by the cam 410 e. Thus, the inserted disc is mountedon the disc supporting plate 301 a of the tray.

Next, as shown in FIG. 20, the driving roller 101 is moved from the disccarrying position to the retracted position. At that time, the drivingroller moves while rotated in the disc feeding direction. Therefore, thedisc is not moved to the retracted position. When the driving rollerreaches to the retracted position, the disc is released from the roller,so that disc falls on a holding surface 301 a (FIG. 2b) of the secondtray.

Thereafter, the slide member 6 is moved to lower the movable plate 400.When the pin 400 c reaches the second step, the slide member 6 isstopped. Therefore, the plate 400 is positioned at the position shown inFIG. 17. Furthermore, the tray moving member 410 is rotated in thecounterclockwise direction so that cams 410 d and 410 e are releasedfrom the projections 301 f of the trays.

Next, the slide member 6 is further moved. When the pin 400 c reachesthe lower most step, the slide member is stopped. Thus, the operationfor carrying the disc to the tray finishes.

The operation for discharging disc is the same as the above describedoperation except the rotating of the driving roller 101 in the discdischarge direction.

The operation for reproducing the disc held on the tray will bedescribed hereinafter.

In the waiting state shown in FIG. 16, when the reproduction of the discheld on the second disc is instructed, the movable plate 400 is raisedso that the tray moving member 410 and the disc player 200 arepositioned at the second tray.

Next, a space for inserting the disc player 200 is formed between thesecond tray and the third tray, by the rotation of the tray movingmember 410 in the clockwise direction, which operation is the samemanner as above description as shown in FIG. 17.

Thereafter, the tray moving member 410 is further rotated in theclockwise direction, so that the third to sixth trays are moreoverraised from the position of FIG. 17. At the same time, the second trayis raised by the cam 410 f. On the other hand, the first tray is pressedby the outside of the cam 410 e, thereby prevented from moving. Thus, asshown in FIG. 21, a large space is formed under the second tray, so thatthe player 200 can be inserted. The projection 301 f of the second trayis deeply inserted in the hole 410 c to be held by the tray movingmember 410.

Next, the disc player 200 is moved from retracted position to thereproduction position in the above described spaces by the player movingmechanism as shown in FIG. 12. At that time, the clamper 202 and theturntable 201 are separated from each other as shown in FIG. 21. Whenthe player 200 is positioned at the reproduction position, the clamper202 is lowered to clamp the disc on the turntable 201. At the same time,the tray moving member 410 is slightly rotated in the counterclockwisedirection to lower the second tray. Therefore, the disc on the secondtray is clamped by the clamper and the turntable as shown in FIG. 22.Thus, the disc is reproduced.

The rotation of the tray moving member 410 in the counterclockwisedirection causes the third tray through sixth tray to lower from theposition of FIG. 21 to the position of FIG. 22. The space occupied bythe six trays is consequently reduced, thereby reducing the spacenecessary for the floating support of the device. Thus, the whole sizeof the device is reduced as described below.

Referring to FIGS. 23a through 23 c, FIG. 23a shows the condition wherethe disc player 200 is at the retracted position, FIG. 23b shows theplayer is at the reproducing position, and FIG. 23c shows the discreproducing state.

The chassis 1 is supported by springs 501 in a case 500 in a floatingstate. A floating lock device 502 is provided for locking the chassis 1.

In the condition of FIG. 23b, the space occupied by the storage 300becomes maximum. If the reproducing device is composed to reproduce thedisc in the condition of FIG. 23b, the case 500 must be formed to have asize larger than the maximum space.

In the embodiment of the present invention, since the space occupied bythe storage is reduced during the reproduction of the disc where thelocking is released, it is not necessary to increase the size of thecase from the maximum space of FIG. 23b, and hence the space necessaryto the floating support can be ensured by the maximum space. Thus, thecase can be reduced in size to a minimum size.

It will be understood that the disc reproducing portion of the presentinvention is locked at the reproducing position, thereby ensuring thereproduction of the disc without being affected by vibration.

While the invention has been described in conjunction with preferredspecific embodiment thereof, it will be understood that this descriptionis intended to illustrate and not limit the scope of the invention,which is defined by the following claims.

What is claimed is:
 1. A disc reproducing device comprising: a discstorage; a plurality of trays, each for holding a disc, arranged in adisc arranging direction in the disc storage; a shaft provided on achassis; a movable base provided to be rotated about the shaft; a discplayer having a turntable, a disc cramper and a pickup, and mounted onthe movable base; driving means for rotating the movable base between aretracted position and a disc reproducing position; lock means providedon the chassis for engaging with the movable base at the discreproducing position.
 2. The device according to claim 1 wherein thelock means comprises two lock means to be engaged with movable base attwo positions.
 3. The device according to claim 2 wherein the two lockmeans comprises a lock member mounted on the chassis, and a lock armpivotally mounted on the chassis so as to be moved between a retractedposition and an engaging position.
 4. The device according to claim 2wherein the two positions are positioned at both sides of a lineconnecting the shaft and a center of the turntable.
 5. The deviceaccording to claim 2 wherein a center of the turntable is positioned inan area surrounded by three lines connecting the two positions and theshaft.